| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [modal v] [be] [verb] [prep] a | 519 |
|
| 2 | it [modal v] [be] [verb] [prep] a | 519 |
|
| 3 | it [modal v] [be] [verb] at [art] | 76 |
|
| 4 | it [modal v] [be] [verb] at [art] | 76 |
|
| 5 | [pron] [modal v] [be] [verb] at a | 67 |
|
| 6 | it [modal v] [be] [verb] at a | 16 |
|
| 7 | it [modal v] [be] [verb] at a | 12 |
|
